Abstract
AbstractA new method was developed for the synthesis of spiro[azepane-4,3′-indol]-2′(1′H)-ones in yields of up to 96% with a broad substrate scope by using oxotryptamines as dual-nucleophilic reagents to react with allenoates in the presence of cesium carbonate under mild conditions. In accord with previous works and a deprotonation-tracing experiment, a plausible reaction mechanism is proposed.
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